Weeks 26 & 27

Week 26: Eyes remain closed

Your baby weighs between 1 1/2 and 2 pounds. The eyebrows and eyelashes are well formed, and the hair on your baby's head is longer and more plentiful. Although your baby's eyes are fully developed, they may not open for another two weeks.

Week 27: Second trimester ends

This week marks the end of the second trimester. Your baby's lungs, liver and immune system are continuing to mature — and he or she has been growing like a weed. At 27 weeks, your baby's length will have tripled or even quadrupled from the 12-week mark.